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Fangs, also referred to as Bats, are blue bats with red wings that have the same mannerisms as Swoops. Fangs appear in the cave levels of Super Mario World 2: Yoshi's Island, Yoshi's Island: Super Mario Advance 3, Super Princess Peach, Yoshi's Island DS and Yoshi's New Island. When Yoshi (or the protagonist of whatever game they are encountered in) gets too close to one, the Fang will fly in his direction from its sleeping position. For unknown reasons, when Fangs fly, they leave a short dashed line behind them. Yoshi can eat Fangs to create Eggs.
Super Mario World 2: Yoshi's Island / Yoshi's Island: Super Mario Advance 3
Fangs appear in Super Mario World 2: Yoshi's Island as enemies of Yoshi which try to damage him by swooping down at him when he gets too close, and are found in the various cave levels. The Fangs tend to loop around as the fly, although this is inconsistent. The art depicts them as purple, but the game itself has them as a sky blue.
Yoshi's Island DS
In Yoshi's Island DS, Fangs return, and are classified as Airborne Enemies in the Island Museum. Despite this, Fangs are seen more in cave areas than in open areas. In this game, they first appear is World 3-5, Heeeeeeere's Wario!
Yoshi's New Island
Fangs once again appear in Yoshi's New Island, with one, named Count Fang, being turning supersized thanks to Kamek's magic mallet, and is the boss of World 2. Count Fang is surrounded by purple Fangs known as Slave Basa.
Yoshi Touch & Go
Fangs are also seen in Yoshi Touch & Go, where they patrol ground areas and appear not only in caves, but also in additional areas such as jungles and fields. These Fangs can only be found sleeping on ceilings in cave stages, and are otherwise always in flight, soaring up and down at varying intervals. If shot down with an egg or stomped, these Bats are worth two points, and encasing them in a bubble can earn the player a Blue Coin. In this game, Fangs are purple. On a related note, Bats were also present in the Balloon Trip tech demo which eventually evolved into the final Yoshi Touch & Go. In Balloon Trip, Fangs were found in the sky (an area they were ironically absent from in Yoshi Touch & Go) and continually circled around; such a role was taken up by red Fly Guys in the final Yoshi Touch & Go.
Yoshi's Woolly World / Poochy & Yoshi's Woolly World
Fangs reappear in Yoshi's Woolly World made out of wool. When the fangs fly they leave long, purple dashed trails in a similar manner to that of running stitch. Fangs also appear in the remake of the game Poochy & Yoshi's Woolly World.
Super Princess Peach
Fangs also appear in the Nintendo DS game, Super Princess Peach. Once again they are enemies which try to defeat the protagonist, but this time it is Princess Peach instead of Yoshi. They appear along with another variant called Glad Fangs and fly right at Peach instead of just around the screen. In several levels, small versions are grouped in clusters which Peach must remove by using the Rage vibe to scare them away. Their wings are now yellow instead of red, while Glad Fangs have red wings instead.
Names in other languages